21881979

素因数分解:

$3^2\times 7^2\times {\mathrm{29}}^2\times {\mathrm{59}}^1$

素因数の和:137

約数の個数: 54

約数和(自身を含む): 38724660

約数和(自身を除く): 16842681

約数列:

[1, 3, 7, 9, 21, 29, 49, 59, 63, 87, 147, 177, 203, 261, 413, 441, 531, 609, 841, 1239, 1421, 1711, 1827, 2523, 2891, 3717, 4263, 5133, 5887, 7569, 8673, 11977, 12789, 15399, 17661, 26019, 35931, 41209, 49619, 52983, 83839, 107793, 123627, 148857, 251517, 347333, 370881, 446571, 754551, 1041999, 2431331, 3125997, 7293993, 21881979]

約数ペア:

[(1, 21881979), (3, 7293993), (7, 3125997), (9, 2431331), (21, 1041999), (29, 754551), (49, 446571), (59, 370881), (63, 347333), (87, 251517), (147, 148857), (177, 123627), (203, 107793), (261, 83839), (413, 52983), (441, 49619), (531, 41209), (609, 35931), (841, 26019), (1239, 17661), (1421, 15399), (1711, 12789), (1827, 11977), (2523, 8673), (2891, 7569), (3717, 5887), (4263, 5133)]